Only then______how much damage had been caused.

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问题 Only then______how much damage had been caused.

选项 A、she realized
B、she had realized
C、had she realized
D、did she realize

答案D

解析 only位于句首修饰状语then,全句要进行部分倒装,由then又知道主句时态应用一般过去时态。故选D。
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